How did you get that information? I haven't been able to find anything on eBay associated with that number. Did the auction end without a sale? It seems very unlikely to me that Stephen could have sold the instrument without being aware of it.

The box was sold to some bloke in South America who couldn't speak English. He obviously hadn't read the description. After agreeing to buy, he started haggling and fretting about the customs duties and bribes he's have to pay to get it (as far as I could grasp through Google Translate). So actually it is now available for sale as before. Price and description as at the top of this posting.